Sunekichi Honekawa

Sunekichi Honekawa is the older cousin of Suneo and the step-grandson of Kaminari. He is an expert in radio controlled toys and other technologies. He often takes Suneo and his friends (usually excluding Nobita) on trips. He treats Suneo like his own brother. He looks a bit like Suneo.
He is different than his cousin, Suneo. he is taller than Suneo and has the same height as Suneo's Parents.

(Source: Doraemon Wiki)